fsbc-20260709 0001275168 FALSE 0001275168 2026-07-09 2026-07-09 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of report (Date of earliest event reported): July 9, 2026 FIVE STAR BANCORP (Exact Name of Registrant as Specified in Charter) California 001-40379 75-3100966 (State or Other Jurisdiction of Incorporation) (Commission File Number) (I.R.S. Employer Identification No.) 3100 Zinfandel Drive, Suite 100 , Rancho Cordova , California , 95670 (Address of Principal Executive Offices, and Zip Code) (916) 626-5000 Registrant’s Telephone Number, Including Area Code Not Applicable (Former Name or Former Address, if Changed Since Last Report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions ( see General Instruction A.2. below): ☐ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communication pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communication pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol(s) Name of each exchange on which registered Common Stock, no par value per share FSBC The Nasdaq Stock Market LLC Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR §230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR §240.12b-2). Emerging growth company ☑ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ Item 7.01    Regulation FD Disclosure O n July 9, 2026, Five Star Bancorp (the “Company”) issued a press release announcing the anticipated dates of its earnings release and webcast reporting its financial results for the second quarter ended June 30, 2026. A copy of the July 9, 2026 press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K. This information (including Exhibit 99.1) is being furnished under Item 7.01 hereof and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and such information shall not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits (d) Exhibits Number Description 99.1 Press Release dated July 9 , 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL) SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. FIVE STAR BANCORP By: /s/ Heather C. Luck Name: Heather C. Luck Title: Executive Vice President and Chief Financial Officer Date: July 10, 2026

Five Star Bancorp announced the anticipated dates for its Q2 2026 earnings release and webcast on July 9, 2026, demonstrating commitment to timely investor communication through Regulation FD disclosure.

On July 9, 2026, Five Star Bancorp issued a press release detailing the anticipated dates for its earnings release and webcast for financial results pertaining to the second quarter ending June 30, 2026. This press release is described as a Regulation FD disclosure, highlighting the Company's commitment to timely information sharing with investors. The press release indicates that it will provide essential insights into the Company's performance during the specified period, contributing to transparency and informed investment decisions.

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